The geomagnetic field was quiet to active on March 10. The high latitude magnetometer at Andenes recorded quiet to minor storm levels. A disturbance was observed beginning at DSCOVR at 16:39 UT.
Solar flux density measured at 20h UT on 2.8 GHz was 127.1 - increasing 14.0 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 87.71). The Potsdam WDC planetary A index was 8 (STAR Ap - based on the mean of three hour interval ap indices: 8.0). Three hour interval K indices: 21111242 (planetary), 22232332 (Boulder), 41014554 (Andenes).
The background x-ray flux is at the class B6 level (GOES 16).
At the time of counting spots (see image time), spots were observed in 10 active regions using 2K resolution (SN: 230) and in 9 active regions using 1K resolution (SN: 146) SDO/HMI images.
Region 12960 [S19W22] decayed slowly and
quietly.
Region 12962 [N27W10] was mostly quiet and stable. The region was the
source of a very long duration C2.8 event peaking at 20:32 UT. The event
began at 18:10 UT and ended at 06:20 UT on March 11 when background levels
were reached. A nearly symmetrical full halo CME was observed beginning from
19:12 UT in LASCO imagery. Most of the ejecta were observed to the north and
it is uncertain whether Earth is within the path of the CME core.
Region 12964 [S27W56] gained area and produced a single C flare. The region has reversed polarities.
Region 12965 [N22E48] developed slowly and quietly.
Region 12966 [S23W62] was quiet and stable.
Spotted regions not observed (or interpreted
differently) by SWPC:
S7393 [S17W79] decayed slowly and quietly.
New region S7417 [S19E26] emerged with tiny spots.
New region S7418 [S18E69] emerged with tiny spots.
New region S7419 [S21E83] rotated into view with a tiny spot.
New region S7420 [S16W11] emerged with a tiny spot.
An active region (S7421) is rotating into view at the northeast limb early on March 11, this region produced a C2 flare just before midnight.
C2+ flares:
Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
C2.8 | 20:32 | N27W07 | 12962 | GOES16 | LDE, full halo CME |
C3.1 | 20:56 | S27W53 | 12964 | GOES16 | |
C2.6 | 23:43 | N16E90 | S7421 | GOES16 |
March 8-9: No obviously Earth directed CMEs
were observed in available LASCO imagery.
March 10: A full halo CME was observed after the very long duration
event in AR 12962. The CME could reach Earth on March 13 and cause unsettled
to minor storm conditions.
[Coronal hole history (since October 2002)]
[Compare today's report to the situation one solar rotation ago:
28 days ago
27 days ago
26 days ago]
A small southern hemisphere coronal hole (CH1068) will likely rotate across the central meridian on March 11.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over upper middle and high latitudes is poor. Propagation on long distance northeast-southwest paths is poor.
The geomagnetic field is expected to be quiet to active on March 11 and quiet to unsettled on March 12 and initially on March 13. Late on March 13 the March 10 CME could arrive and cause unsettled to minor storm conditions.
Coronal holes (1) | Coronal mass ejection (2) | M and X class flares (3) |
1) Effects from a coronal hole
could reach Earth within the next 5 days. When the high speed
stream has arrived the color changes to green.
2) Effects from a CME are likely to be observed at Earth within 96 hours.
3) There is a possibility of either M or X class flares within the next 48 hours.
Green: 0-30% probability, Yellow: 30-70% probability, Red: 70-100% probability.
(Click on image for 2K resolution).
4K resolution.
Compare to the previous day's image. 0.5K image
When available the active region map has a coronal hole polarity overlay where red (pink) is negative and blue is positive.
Data for all officially numbered solar regions according to the Solar Region Summary provided by NOAA/SWPC, all other regions are numbered sequentially as they emerge using the STAR spot number. Comments are my own, as is the STAR spot count (spots observed at or inside a few hours before midnight) and data for regions not numbered by SWPC or where SWPC has observed no spots. SWPC active region numbers in the table below and in the active region map above are the historic SWPC/USAF numbers. SWPC data considered to be not sufficiently precise (location, area, classification) are colored red.
Active region | SWPC date numbered STAR detected |
Spot count | Location at midnight | Area | Classification | SDO / HMI 4K continuum image with magnetic polarity overlays |
Comment | ||||
---|---|---|---|---|---|---|---|---|---|---|---|
SWPC/ USAF |
Magnetic (SDO) |
SWPC | STAR | Current | Previous | ||||||
2K | 1K | ||||||||||
12957 | 2022.02.26 2022.02.27 |
1 | S16W79 | 0090 | HSX |
location: S12W94 spotless The original AR 12957 has rotated out of view. |
|||||
12958 | 2022.02.27 2022.02.28 |
N17W82 |
location: N18W71 |
||||||||
S7393 | 2022.02.27 | 1 | 1 | S17W79 | 0050 | HSX |
SWPC has this as AR 12957 |
||||
12959 | 2022.03.02 2022.03.03 |
S19W72 |
|
||||||||
12960 | 2022.03.02 2022.03.03 |
5 | 25 | 16 | S20W18 | 0390 | EHO | DHO |
location: S19W22 |
||
S7404 | 2022.03.05 | N13W47 | |||||||||
12963 | 2022.03.05 2022.03.07 |
S18W52 | |||||||||
12962 | 2022.03.05 | 1 | 19 | 6 | N27W08 | 0010 | AXX | CRO | location: N27W10 | ||
S7407 | 2022.03.06 | N09W37 | |||||||||
12964 | 2022.03.06 2022.03.07 |
5 | 26 | 9 | S28W54 | 0070 | DSO | DAI |
reversed polarities area: 0180 location: S27W56 |
||
S7409 | 2022.03.06 | N19W08 | |||||||||
12965 | 2022.03.08 | 14 | 42 | 16 | N23E47 | 0600 | EKI | FAI | |||
S7411 | 2022.03.08 | S27W11 | |||||||||
12966 | 2022.03.08 2022.03.09 |
4 | 9 | 4 | S23W61 | 0010 | BXO | DRI |
area: 0025 location: S24W62 |
||
S7414 | 2022.03.09 | S32E03 | |||||||||
S7415 | 2022.03.09 | S31W41 | |||||||||
S7417 | 2022.03.10 | 3 | 2 | S19E26 | 0006 | AXX | |||||
S7418 | 2022.03.10 | 3 | 1 | S18E69 | 0006 | BXO | |||||
S7419 | 2022.03.10 | 1 | S21E83 | 0001 | AXX | ||||||
S7420 | 2022.03.10 | 1 | 1 | S16W11 | 0003 | AXX | |||||
Total spot count: | 30 | 130 | 56 | ||||||||
Sunspot number: | 90 | 230 | 146 | (total spot count + 10 * number of spotted regions) | |||||||
Weighted SN: | 80 | 161 | 87 | (Sum of total spot count + classification weighting for each AR. Classification weighting: X=0, R=3, A/S=5, H/K=10) | |||||||
Relative sunspot number (Wolf number): | 99 | 127 | 117 |
Month | Average solar flux | International sunspot number (WDC-SILSO) |
Smoothed sunspot number (4) | Average ap (3) |
|
---|---|---|---|---|---|
Measured | 1 AU | ||||
2014.02 | 170.3 (cycle peak) |
166.3 | 146.1 (SC24 peak) | 110.5 | 10.70 |
2014.04 | 143.9 | 144.8 | 112.5 | 116.4 (solar max) | 7.88 |
2017.09 | 91.3 | 92.3 | 43.6 | 18.2 (-1.3) | 18.22 (cycle peak) |
2019.11 | 70.2 | 68.7 | 0.5 | 2.0 (-0.6) (Solar minimum using 365d smoothing: November 17, 2019) |
4.19 |
2019.12 | 70.8 | 68.6 | 1.6 | 1.8 (-0.2) (ISN 13 months smoothed solar minimum) |
3.22 |
2020.08 | 71.6 | 73.4 | 7.5 | 9.5 (+0.5) | 5.68 |
2020.09 | 70.7 | 71.4 | 0.7 | 10.5 (+1.0) | 8.59 |
2020.10 | 74.6 | 74.2 | 14.6 | 11.9 (+1.4) | 6.13 |
2020.11 | 89.9 | 88.0 | 34.5 | 13.6 (+1.7) | 4.77 |
2020.12 | 86.9 | 84.2 | 23.1 | 15.3 (+1.7) | 4.72 |
2021.01 | 76.0 | 73.6 | 10.4 | 17.3 (+2.0) | 4.39 |
2021.02 | 74.3 | 72.4 | 8.2 | 19.0 (+1.7) | 9.50 |
2021.03 | 76.0 | 75.2 | 17.2 | 21.7 (+2.7) | 10.17 |
2021.04 | 75.9 | 76.4 | 24.5 | 24.8 (+3.1) | 8.40 |
2021.05 | 75.3 | 77.1 | 21.2 | 25.8 (+1.0) | 6.50 |
2021.06 | 79.4 | 81.8 | 25.0 | 27.7 (+1.9) | 5.52 |
2021.07 | 81.0 | 83.6 | 34.3 | 31.4 (+3.7) | 5.51 |
2021.08 | 77.7 | 79.7 | 22.0 | 35.3 (+3.9) | 6.19 |
2021.09 | 87.0 | 88.2 | 51.3 | (39.9 projected, +4.6) | 6.33 |
2021.10 | 88.9 | 88.3 | 38.1 | (43.6 projected, +3.7) | 7.38 |
2021.11 | 86.2 | 84.4 | 35.0 | (48.2 projected, +4.6) | 9.83 |
2021.12 | 103.0 | 99.8 | 67.6 | (54.0 projected, +5.8) | 6.40 |
2022.01 | 103.8 | 100.5 | 54.0 | (57.7 projected, +3.7) | 8.92 |
2022.02 | 109.1 | 106.5 | 59.7 | (62.4 projected, +4.7) | 10.5 |
2022.03 | 114.4 (1) | 26.8 (2A) / 83.0 (2B) / 81.0 (2C) | (67.9 projected, +5.5) | (9.6) | |
2022.04 | (73.0 projected, +5.1) | ||||
2022.05 | (79.4 projected, +6.4) | ||||
2022.06 | (85.3 projected, +5.9) | ||||
2022.07 | (92.6 projected, +7.3) | ||||
2022.08 | (99.2 projected, +6.6) |
1) Running average based on the daily 20:00 UTC observed solar flux value at 2800 MHz
and any corrections applied to that measurement.
2A) Current impact on the monthly sunspot number based on the Boulder (NOAA/SWPC) sunspot number (accumulated daily sunspots / month days).
2B) Boulder SN current month average to date.
2C) STAR SDO 1K Wolf number 30 day average.
3) Running average based on the quicklook and definitive Potsdam WDC ap indices. Values in red
are based on the definitive international
GFZ Potsdam WDC ap indices.
4) Source: SIDC-SILSO.
This report has been prepared by Jan Alvestad. It is based on the analysis of data from whatever sources are available at the time the report is prepared. All time references are to Universal Time. Comments and suggestions are always welcome.
SDO images are courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.